<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var cj = prompt("成绩");
         if(cj>=60){
            console.log('合格');
         } 
         else{
            console.log('不合格')
         }
    </script>
</body>
</html>